一、问题的提出在几何光学的学习中 ,我们经常会碰到例如下面的问题 .1 .一块 1 5 mm厚的玻璃板 ,放在铺有报纸的水平桌面上 ,当我们从玻璃板的正上方向下看时 ,报纸上的文字好像升高了 5 mm,该玻璃的折射率 n=　　　　 .2 .在水中同一深度有红、绿色两个点光源 ,在水面上分别 First, the problem raised in the study of geometric optics, we often encounter the following issues such as: 1. A 15 mm thick glass plate, placed on a horizontal desktop with newspapers, when we are from the glass plate When viewed from above, the text in the newspaper seems to have risen by 5 mm. The refractive index of the glass is n = .2. There are red and green point lights at the same depth in the water.